Set logged-in flag after manual login

Not just after loading a session

matrix_appservice_kakaotalk/user.py

@@ -592,6 +592,7 @@ class User(DBUser, BaseUser):
         self.oauth_credential = oauth_credential
         self.client = Client(self, log=self.log.getChild("ktclient"))
         await self.save()
+        self._is_logged_in = True
         try:
             self._logged_in_info = await self.client.fetch_logged_in_user(post_login=True)
             self._logged_in_info_time = time.monotonic()